add Fibonacci.cpp

YuYinCUG · Oct 30, 2016 · dd499f8 · dd499f8
1 parent 0bb801e
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diff --git a/Fibonacci.cpp b/Fibonacci.cpp
@@ -0,0 +1,22 @@
+//斐波那契数列
+
+int Fibonacci(n)
+{
+  int result[2] = {0, 1};
+
+  if(n < 2)
+  {
+    return result[n];
+  }
+
+  long long fibNMinusOne = 1;
+  long long fibNMinusTwo = 0;
+  long long fibN = 0;
+  for(unsigned int i = 2; i <= n; ++ i)
+  {
+    fibN = fibNMinusOne + fibNMinusTwo;
+    fibNMinusTwo = fibNMinusOne;
+    fibNMinusOne = fibN;
+  }
+  return fibN;
+}
diff --git a/README.md b/README.md
@@ -1,6 +1,7 @@
 # 剑指offer题集
 
 - [面试题4：从尾到头打印链表](https://github.com/YuYinCUG/jianzhioffer/blob/master/PrintListReversingly.cpp)
+- [面试题9：斐波那契数列](https://github.com/YuYinCUG/jianzhioffer/blob/master/Fibonacci.cpp)
 - [面试题13：在O(1)时间删除链表结点](https://github.com/YuYinCUG/jianzhioffer/blob/master/DeleteNode.cpp)
 - [面试题16：反转链表](https://github.com/YuYinCUG/jianzhioffer/blob/master/ReverseList.cpp)
 - [面试题35：第一个只出现一次的字符](https://github.com/YuYinCUG/jianzhioffer/blob/master/FirstNotRepeatingChar.cpp)